What is "great swift"

Ghost \Ghost\ (g[=o]st), n. [OE. gast, gost, soul, spirit, AS. g[=a]st breath, spirit, soul; akin to OS. g[=e]st spirit, soul, D. geest, G. geist, and prob. to E. gaze, ghastly.]

1. The spirit; the soul of man. [Obs.]

   Then gives her grieved ghost thus to lament.
   --Spenser.

2. The disembodied soul; the soul or spirit of a deceased person; a spirit appearing after death; an apparition; a specter.

   The mighty ghosts of our great Harrys rose.
   --Shak.

   I thought that I had died in sleep, And was a blessed ghost.
   --Coleridge.

3. Any faint shadowy semblance; an unsubstantial image; a phantom; a glimmering; as, not a ghost of a chance; the ghost of an idea.

   Each separate dying ember wrought its ghost upon the floor.
   --Poe.

4. A false image formed in a telescope by reflection from the surfaces of one or more lenses.

   Ghost moth (Zo["o]l.), a large European moth ( Hepialus humuli); so called from the white color of the male, and the peculiar hovering flight; -- called also great swift.

   Holy Ghost, the Holy Spirit; the Paraclete; the Comforter; (Theol.) the third person in the Trinity.

   To give up the ghost or To yield up the ghost, to die; to expire.

   And he gave up the ghost full softly.
   --Chaucer.

   Jacob . . . yielded up the ghost, and was gathered unto his people.
   --Gen. xlix. 33.